Telegraph-relay.



No. 782,254. PATENTED FEB. 14, 1905. J. W. LARISH.

TELEGRAPH RELAY.

APPLICATION FILED AUG.18.1904.

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No. 782,254. PATENTED FEB. 14, 1905. J. W. LARISH.

TELEGRAPH RELAY.

APPLICATION FILED me.1s,1904.

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q 0 "mm? WWWWgJ N N W N Wong/4g? f @Hliys UNITED STATES PatentedFebruary 14, 1905.

PATENT OEEIcE.

JOSEPH W. LARISH, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE UNITEDPRESS, OF NEIV YORK, N. Y., A CORPORATION OF NEW JERSEY.

TELEGRAPH-RELAY.

SPECIFICATION forming part of Letters Patent No. 782,254, dated February14, 1905.

Application filed August 18, 1904:. Serial No. 221,211.

To all whom it may concern:

Be itknown that LJosnrl-r W. LARISH, a citizen of the United States,residing at Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inTelegraph-Relays, of which the following is a specification, referencebeing had to the drawings accompanying and forming a part of the same.

My invention resides, primarily, in a novel relay for telegraph systemswhich possesses the capability of automatic or self adjustment and ofrecording simultaneously two distinct and independent signals.

While applicable generally for telegraphic purposes, and particularly onlong lines, by reason of its sensitiveness, my improvement v Wasespecially designed for use in composite telegraph and telephonesystems, in connection with which I have illustrated it, that its natureand purpose may be more readily understood.

The improved instrument as a whole comprises, first, a relay of peculiarand novel construction having a polarized armature responsive toreversals of current irrespective of their strength; second, a neutralrelay adjusted to respond only to current impulses of a predeterminedincreased strength, and, third, an induction-coil having its primary inthe line and its secondary closed through the polarized relay. Inpractice I combine the neutral relay and induction-coil in a singleinstrument, utilizing the primary and core of the latter as thecontrolling-magnet for the armature of the former, and adjust theretractile force of the armature so that mature controls a local circuitwith signaling devices connected therewith, so that the local circuitunder the control of the polarized relay may be operated withoutaffecting the other, or both may be operated simultaneously by sendingto line currents of the proper strength.

The polarized relay which I have devised consists, in general terms, ofa solenoid or helix, through which extends longitudinally acentrally-pivoted bar of soft iron, the projecting extremities of whichplay between the poles of magnets oppositely disposed, so as to combinetheir effects in oscillating or deflecting the bar to one side or theother, according to the polarity imparted to it by the current flowingin the solenoid. The play of the bar is limited by the usual adjustablecontact-stops, one of which, together with the bar itself, is connectedwith the local circuit controlled by its oscillations.

My invention involves other details of construction,which will bedescribed by reference to the drawings, illustrating, as I have statedabove, a combined telegraph and telephone system and the manner of usingthe instruments above described.

Figure 1 is a view, partly diagrammatic, illustrating the details ofconstruction of the relay instrument. Fig. 2 is a diagram illustratingby conventional figures a combined telegraph and telephone system withthe relay connected therewith.

Referring to Fig. 1, A designates a helix of insulated wire, such asordinarily employed in the construction of relay instruments. B is asoft-iron bar which constitutes the armature and which extendslongitudinally through the helix A, being pivotally supported at itscenter within the coil. The extremities of the bar B extend beyond bothends of the helix and between the poles of permanent magnets O O, whichare oppositely disposed at the two ends. Stops D D are placed onopposite sides of one end of the armature B and limit its movement,preventing contact with either magnet-pole. E is a local circuitconnected to one of the stops D and to the arma ture B through itspivotal support. It includes a battery F and a sounder or similar lunderstanding of my improvement to describe instrument Gr.

helix or coilA. \Vhcn, therefore, the current is made through theprimary K, an impulse in one direction is developed in the secondary;but when the current in the primary is broken an opposite impulse is setup in the sccoiulary which, with the connections and arrangement shown,will operate to throw the armature B on and off its contact-stop andproduce a corresponding signal in the sounder G. The secondary circuitis normally made through a neutral armature L and a back contact Z. Thisarmature is operated by a magnet in theline, preferably theinduction-coil itself, and is so adjusted by means of aretracting-spring that it does not respond to impulses of normalstrength, but only to those of a predetermined increased strength. Itcontrols a local circuit M, containing a battery N and a call-bell orother instrument 0, the ends of the local circuit being connected to theforward contact m and to the armature, respectively. Around the point ofcontact between armature L and the stop Z is a resistance R, which isthrown into the secondary circuit the instant that armature L leavessaid stop. Thus although the armature L is set in operation by anincreased current the polarized relay receives only the normal or weakcurrent by reason of the compensating effect of the resistance thusintroduced.

Referring now to Fig. 2, the numerals 1 2 designate the wires of acombined telegraph and telephone circuit; 2 2, the linebattcries orconstant-voltage generators, with opposite poles grounded and the othersconnected to the two line-wires through compensating re sistances 3 3.Each line is provided with the usual transmitting-key 4. The telephonesare connected in shunts 5 5, containing condensers 6 6 in the usual way,so that the system may be simultaneously operated for Morse signals andfor the transmission of speech.

The relays above described are connected with the lines in the usualmanner, Morse signals being sent by the keys 4 and received by thesounders G. The current impulses for this operation are reduced to thedesired strength by resistances 8 8, which shunt a definite proportionof the current to ground. When, however, it is desired to call up thetelephone at the distant end of the line, the home resistance 8 isdisconnected by the depression of a key 9, thus throwing an increasedcurrent to line when key a is operated. This increased current withoutinterfering with the operation of the polarized relay and sounder at thedistant end attracts the arma ture L and closes the local circuitcontaining the call-bell. Any other well-known means may be employed tosend the increased current to line.

1 have not regarded it as necessary to an H is the core of an inductioncoil, the secondary l of which includes the in greater detail thearrangement of the system which permits both Morse instruments andtelephones to be used simultaneously. As this is well known and largelyused, 1 may remark, however, that the metallic line, which is desirablefor the use of telephones, affords two lines for Morse work and that myimproved relays may be used in both lines, together with the usual keys,sounders, switches, and other appurtenances.

The specific character of the induction-coil may be greatly varied; butinasmuch as a certain inductance is required in combined telegraph andtelephone systems in the portions of the circuit beyond that used fortelephonic transmission the induction-coils are conveniently made tosupply this inductance. They should, therefore, be constructed in anywellknown way to have a relatively high self-induction. in otherrespects the details of the system may be greatly varied withoutdeparture from the invention.

What I claim is 1. A telegraphic instrument comprising in combination apolarized relay, a neutral relay responsive to increased currents only,a local circuit controlled by each of said relays, and aninduction-coil, the secondary of which is in circuit with the polarizedrelay, and its primary in the line, as set forth.

2. A telegraphic instrument comprising in combination a polarized relay,a neutral relay responsive to increased currents only, and a localcircuit for each, an induction-coil having its secondary in circuit withthe polarized relay, and a resistance, adapted to be included in thesecondary circuit by the operation of the neutral relays, as set forth.

' 3. A telegraphic instrument comprising, in combination, a polarizedrelay, a local circuit controlled thereby, an induction-coil, thesecondary of which is in circuit with the polarized relay, and itsprimary in the line, a neutral armature operated by the attraction ofthe core of the induction-coil when energized by an increased current,and a local circuit controlled thereby, as set forth.

4:. A telegraphic instrument comprising in combination a polarizedrelay, a local circuit controlled thereby, an induction-coil, thesecondary of which is in circuit with the polarized relay and theprimary in the line, a neutral armature operated by the magnetism of thecore of the induction-coil and adjusted to respond to increased currentsonly, a local circuit con trolled by said armature, and a resistanceadapted to be included in the secondary circuit by the movement of saidneutral armature, as set forth.

5. In a combined telegraph and telephone system, the combination of apolarized relay, and a local signaling-circuit controlled thereby, aninduction-coil having its secondary in circuit with the polarized relayand its pri- IIC mary in the main line, a neutral armature and magnet inthe main line, said armature being adjusted to respond to increasedcurrent only, a local call-circuit controlled by said armature, andaresistance adapted to be included in the secondary circuit of theinduction-coil by the movement of the armature, as set forth.

6. In a combined telegraph and telephone system, the combination of apolarized relay, composed of a helix, a soft-iron armature centrallypivoted therein and extending longitudinally through the same, andmagnets with oppositely-disposed poles between which the ends of saidarmature play, a local sounder-

